15998555144 has 96 divisors (see below), whose sum is σ = 36654885120. Its totient is φ = 6495984000.

The previous prime is 15998555129. The next prime is 15998555201. The reversal of 15998555144 is 44155589951.

It is a self number, because there is not a number n which added to its sum of digits gives 15998555144.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369599 + ... + 410609.

It is an arithmetic number, because the mean of its divisors is an integer number (381821720).

Almost surely, 2^15998555144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15998555144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18327442560).

15998555144 is an abundant number, since it is smaller than the sum of its proper divisors (20656329976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15998555144 is a wasteful number, since it uses less digits than its factorization.

15998555144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41083 (or 41068 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 56.

The spelling of 15998555144 in words is "fifteen billion, nine hundred ninety-eight million, five hundred fifty-five thousand, one hundred forty-four".